I work in a toolroom for a large plant and am often asked by maintenance to make parts for machines. These are commonly shafts with keyways and/or collars/sleeves/gears/etc with keyways.
I have never learned the correct way to measure on how to cut them, and was wondering if you guys knew how to do it right? Is there some sort of standard I "should know"?
I have used a broach before, but we deal with so many different sizes , there may not always be a spacer to go in the bore to do an internal keyway.
Shafts are not usually a problem, becuase they are out in the open and an endmill will easily knock those out.
I have a wire EDM, and in an instance like now where I have a bore that is not common size, I will just burn it. Problem is, I don't know where to measure from to be sure the key way is deep enough.
Does most keystock measure exactly what it is or is it a tad undersize? For example: Is a 1/2" piece of keystock .500" or closer to .495" +/-?
I have included this picture so my question is a little more clear. Each keyway type has two possibilities where measurements could be obtained. Which is correct?